Adult: Species description based on Savage (1968). A small frog. Males and females are similarly sized (to about 24 mm), but can be distinguished because males have mottling on the throat whereas females throats are white. The third finger of adult males is swollen. Dorsal: The dorsal surface is dark brown, bordered on either side by a lighter dorsolateral stripe. Concealed surfaces: Lateral surface dark except for a light stripe (sometimes fragmented) extending from the groin to halfway to the eye. Rear surface of thighs have two dark marks above and below a central light line. Extremities: Feet have no webbing between the toes.
Tadpole: Tadpoles are pale in color (Savage 1968). Some brown flecks may be present on the dorsal surface (Savage 1968). Mouthparts consist of two upper (one continuous and one partial) and three lower teethrows (Savage 1968).
Habitat: Lowland forest to 1600 m. Ecology: Colostethus pratti populations are likely beginning to decline east of the Panama Canal due to the spread of chytrid fungus to that region (Woodhams et al 2008). Type locality: Santa Ines, N. of Medellin, Republic of Colombia; altitude 3800 feet